All dimensions are in "mm" unless noted otherwise.
Dimensions of Class 2500 Lap Joint Flanges as per ASME B16.5.
| Nominal Pipe Size |
Outside diameter of flange (D) |
Thick of flange (B) |
Diameter of Hub at base (A) |
Length thru Hub (H) |
Dia of bore (ID) |
Fillet radius (r) |
No of holes |
Dia of holes (L) |
Dia of bolts |
Diam of bolt circle (K) |
Approx weight kg |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 133.4 | 30.2 | 42.9 | 39.6 | 22.9 | 3 | 4 | 22.4 | 3/4 | 88.9 | 3 |
| 3/4 | 139.7 | 31.8 | 50.8 | 42.9 | 28.2 | 3 | 4 | 22.4 | 3/4 | 95.3 | 4 |
| 1 | 158.8 | 35.1 | 57.2 | 47.8 | 35.1 | 3 | 4 | 25.4 | 7/8 | 108 | 5 |
| 1-1/4 | 184.2 | 38.1 | 73.2 | 52.3 | 43.7 | 4.8 | 4 | 28.4 | 1 | 130 | 7 |
| 1-1/2 | 203.2 | 44.5 | 79.2 | 60.5 | 50 | 6.4 | 4 | 31.8 | 1-1/8 | 146.1 | 10 |
| 2 | 235 | 50.8 | 95.3 | 69.9 | 62.5 | 7.9 | 8 | 28.4 | 1 | 171.5 | 17 |
| 2-1/2 | 266.7 | 57.2 | 114.3 | 79.2 | 75.4 | 7.9 | 8 | 31.8 | 1-1/8 | 196.9 | 24 |
| 3 | 304.8 | 66.5 | 133.4 | 91.9 | 91.4 | 9.7 | 8 | 35.1 | 1-1/4 | 228.6 | 36 |
| 4 | 355.6 | 76.2 | 165.1 | 108 | 116.8 | 11.2 | 8 | 41.1 | 1-1/2 | 273.1 | 54 |
| 5 | 419.1 | 91.9 | 203.2 | 130 | 144.5 | 11.2 | 8 | 47.8 | 1-3/4 | 323.9 | 93 |
| 6 | 482.6 | 108 | 235 | 152.4 | 171.5 | 12.7 | 8 | 53.8 | 2 | 368.3 | 143 |
| 8 | 552.5 | 127 | 304.8 | 177.8 | 222.3 | 12.7 | 12 | 53.8 | 2 | 438.2 | 213 |
| 10 | 673.1 | 165.1 | 374.7 | 228.6 | 277.4 | 12.7 | 12 | 66.5 | 2-1/2 | 539.8 | 408 |
| 12 | 762 | 184.2 | 441.5 | 254 | 328.2 | 12.7 | 12 | 73.2 | 2-3/4 | 619.3 | 499 |